 This is because patients with damage to the temporal lobes or underlying structures in the limbic system may lose the ability to form new memories, especially if the damage is within the hippocampal formation, while retaining access to at least some memories from before the injury.Individuals with this type of brain damage are not able to form new memories after the incident that caused the brain damage, but they still have access to memories that happened before the brain damage occurred.If the brain damage was present at the age of 10, the individual may not remember anything from between the age of 10 and 30 and have no reminiscence bump.